DE1033732B - Circuit arrangement for telecommunications systems, in particular telephone systems with direction switches - Google Patents

Description

In telephone systems with dialer operation, in particular in long-distance dialing, various Line bundle so-called directional selector is used, which, controlled by a memory device, work as marking selectors. At the exits the direction selector can be connected to two types of trunk groups. These are once Trunks that allow overflow when all lines are busy, d. that is, the connection you want can still use another direction, e.g. B. Key figure path, and on the other hand Bundles in which, if all lines are busy, the connection can be set up via another Direction is no longer possible. In the first case, if a trunk group is searched in vain, an overflow signal is generated, and in the second case a lane occupied signal is given to the memory device.

So far, in systems in which direction selectors are marked from a memory, at two direction selector stages connected in series, the second direction selector only with a trunk group be equipped without overflow, because when a trunk group is busy, that of a first direction selector leads to a second direction selector, the first direction selector does not make a decision could indicate whether an overflow signal or lane busy was to be given because the intended connection was via the second direction selector could be done via a bundle with or without overflow.

The invention now shows an arrangement which makes it possible to also use bundles in second direction selection stages to be used with and without overflow, and simplifies the previously known arrangements in such a way that that only one type of return signal has to be transmitted for different processes, so that the direction selector have a uniform spinning bundle, regardless of whether the lanes are occupied or Overflow should occur. This is achieved in that when a trunk group is busy with or the same return criterion is given to the memory device without overflow, and that the memory device put into such a switching state when evaluating the recorded code is that the return criterion is either the formation of a new connection path or the lane occupancy feedback initiates.

When a return criterion is received, which initiates an overflow in the memory device while memory switching means are evaluated in such a way that a new return criterion is the activation of a lane occupancy feedback causes.

The invention will now be based on an embodiment shown in the drawing, in which only the

Circuit arrangement

for telecommunications systems, in particular

Telephone systems with directional dialers

Applicant:

Standard Elektrik Aktiengesellschaft,
Stuttgart-Zuffenhausen,
Hellmuth-Hirth-Str. 42

Walter Habig and Dipl.-Ing. Heinz Plitschka,

Stuttgart-Zuffenhausen,
have been named as inventors

Switching measures necessary to understand the invention are shown, explained in more detail.

Fig. 1 shows a connection diagram such. B. two direction selection levels built with different bundles could be;

Figure 2 shows the arrangement by which the use of bundles with and without overflow becomes possible. A telephone subscriber who wishes to set up a long-distance connection occupies a memory via a connection element AN and a search dial, which receives and evaluates the dialing digits sent by him. From this memory, the marking point on the first direction selector is identified in a known manner, the line bundle of which leads in the direction of the desired connection. Was z. B. the trunk group Q 21ItJ has been marked on the first direction selector (/. RW) and there are no more lines free, an overflow criterion was sent back to the memory according to the previously known technology, since in a trunk with overflow the desired traffic direction is still available Remote connection is available. If, on the other hand, the line bundle Q 22IB was marked and all lines are busy here too, an aisle occupied criterion was sent back. However, if the marker changed to the //. RWl or //. RW2 leading trunk group was marked, but no free trunk was reached, so it was not possible to transfer from /. RW to make the decision whether a lane occupied or overflow criterion had to be returned, since it could not be determined whether after reaching the //. RW a line bundle] would have been occupied with or without overflow. That's why the //. RW-Stuit waived that

809 560/171

To equip voters with overflow and instead gave back alley occupancy in this case.

Fig. 2 now shows how it is possible, also at the outputs of the second direction selector II. RW line bundle with overflow, z. Use e.g. Q 24/0 "and Q26 / Ü, and without overflow, e.g. Q 23/5 and Q 251B .

The series of current impulses emitted by the subscriber station which sets up the connection are, as already mentioned, recorded and evaluated by the memory SP. The memory thus knows whether ^r Getting Connected at a to be established \ several paths can be taken. If this is the case, a relay K , not shown, is energized in the memory, the contact k of which energizes relay B. At the same time, the memory marks a certain bundle of lines of a free direction selector, which is started and, after reaching the marked point, searches for the bundle connected to it. Regardless of whether it is a bundle with or without overflow, the same return criterion is given to the memory if all lines in this bundle are busy. If, in the case assumed above, that a connection can still be established via another path, the direction selector does not have a free line output, a relay, e.g. B. G in the direction selector, excited, which gives a return criterion to the memory with its contact g by b, B (IT), U (T), - the relay ü comes into effect. which stays above +, k, ül, 0 "(1I) -, - and causes the memory to initiate the overflow, ie to start a new connection path, e.g. code path, to establish the connection. After switching over the contact μ I relay B is held for the duration of the return pulse via its winding II. After this pulse has ended, relay B drops out, so that when all lines of the newly marked connection path from the memory are again occupied, the newly returned return criterion activates relay G causes which activates a lane busy signal to the calling subscriber.

If, however, when the connection was established, the memory found that there was only one possibility of establishing the desired connection, ie if it marked a bundle without overflow, then contact k is not actuated, relay B is not energized, and this when it is occupied The return criterion that comes into effect immediately switches on relay G , which causes the aisle occupancy feedback.

Claims (2)

Patent claims: 1. Circuit arrangement for telecommunications systems, in particular telephone systems with direction selectors, at their outputs in different directions Leading trunk groups with and without overflow are connected and their setting made by marking on the part of a memory device evaluating the choice is, characterized in that when a trunk group is busy with or without overflow the the same return criterion is given to the memory device and that the memory device at Evaluation of the recorded code is placed in such a switching state that the Return criterion either the connection of a new connection path (overflow) or the Aisle occupancy feedback initiates. 2. Circuit arrangement according to claim 1, characterized in that after the arrival of a return criterion which initiates an overflow in the memory device, memory switching means (B) are evaluated in such a way that a renewed return criterion causes a lane occupancy feedback to be switched on. 1 sheet of drawings © 809 560/171 7.58